The role of the blood-testis barrier in the chemical composition of the seminal plasma of the freshwater teleost Clarias gariepinus

Sperm Quality and Cryopreservation in Teleost: Effect of Seminal Plasma Component and Climate Change

“…The increase in Na + may be related to the high secretory activity in the sperm ducts Weismann, 1993), for P. reticulatum it seems to be one of the fundamental ions in the maintenance of seminal plasma function. For other species of the order Siluriformes, similar concentrations to those obtained in this work were observed, i.e., Clarias gariepinus 125.25±9.80 (Steyn;Van Vuren, 1986); Clarias macrocephalus 164.4±0.6 (Tan-Fermin et al, 1999), Rhamdia quelem 153.7±2.4 (Borges et al, 2005), but the deference may be due to differences in feeding conditions, age, environ-mental factors within the same species due to their reproductive processes. The Na + ion can act directly on the osmotic balance, motility, morphology, and metabolism of sperm (Rodríguez et al, 2013).…”

Sperm Quality and Cryopreservation in Teleost: Effect of Seminal Plasma Component and Climate Change

“…The increase in Na + may be related to the high secretory activity in the sperm ducts Weismann, 1993), for P. reticulatum it seems to be one of the fundamental ions in the maintenance of seminal plasma function. For other species of the order Siluriformes, similar concentrations to those obtained in this work were observed, i.e., Clarias gariepinus 125.25±9.80 (Steyn;Van Vuren, 1986); Clarias macrocephalus 164.4±0.6 (Tan-Fermin et al, 1999), Rhamdia quelem 153.7±2.4 (Borges et al, 2005), but the deference may be due to differences in feeding conditions, age, environ-mental factors within the same species due to their reproductive processes. The Na + ion can act directly on the osmotic balance, motility, morphology, and metabolism of sperm (Rodríguez et al, 2013).…”

Morphological evidence for a permeability barrier in the testis and spermatic duct ofGymnotus carapo(Teleostei: Gymnotidae)

“…Differences observed in the protein and glycoprotein electrophoretic profiles, obtained from the blood plasma versus testicular and spermatic‐duct fluids of G. carapo , provided additional evidence for restricted fluid flow, as maintained by tight junctions, between the vascular and adluminal compartments of the these organs. Differences between the chemical composition of seminal plasma and blood plasma have already been reported in some fish species (Steyn and Van Vuren, ; Viljoen and Van Vuren, ; Li et al, ). One functional consequence of this barrier is to maintain a gradient of ions, small molecules, and proteins between blood and seminal fluid.…”

Effects of extracellular environment factors on the motility in Japanese eel spermatozoa

“…As a general rule, pH has been reported as having little effect on the activation of fish spermatozoa. A high pH, however, was reported to intensify and prolong motility in different freshwater and marine teleosts (Stoss and Donaldson, 1982), after 1 h incubation of the sperm from the testis in rainbow trout and chum salmon (Morisawa and Morisawa, 1988), and resulted in aerobic respiration and maximum survival of the sperm in African catfish (Steyn and Van Vuren, 1986). In our study, seawater of pH 2 and pH 13 did not activate eel spermatozoa; the motility of sperm had no significant difference within the pH range of 4–12.…”

Sperm Quality and Cryopreservation in Teleost: Effect of Seminal Plasma Component and Climate Change

“…The increase in Na + may be related to the high secretory activity in the sperm ducts Weismann, 1993), for P. reticulatum it seems to be one of the fundamental ions in the maintenance of seminal plasma function. For other species of the order Siluriformes, similar concentrations to those obtained in this work were observed, i.e., Clarias gariepinus 125.25±9.80 (Steyn;Van Vuren, 1986); Clarias macrocephalus 164.4±0.6 (Tan-Fermin et al, 1999), Rhamdia quelem 153.7±2.4 (Borges et al, 2005), but the deference may be due to differences in feeding conditions, age, environ-mental factors within the same species due to their reproductive processes. The Na + ion can act directly on the osmotic balance, motility, morphology, and metabolism of sperm (Rodríguez et al, 2013).…”

Morphological evidence for a permeability barrier in the testis and spermatic duct ofGymnotus carapo(Teleostei: Gymnotidae)

“…Differences observed in the protein and glycoprotein electrophoretic profiles, obtained from the blood plasma versus testicular and spermatic‐duct fluids of G. carapo , provided additional evidence for restricted fluid flow, as maintained by tight junctions, between the vascular and adluminal compartments of the these organs. Differences between the chemical composition of seminal plasma and blood plasma have already been reported in some fish species (Steyn and Van Vuren, ; Viljoen and Van Vuren, ; Li et al, ). One functional consequence of this barrier is to maintain a gradient of ions, small molecules, and proteins between blood and seminal fluid.…”

Effects of extracellular environment factors on the motility in Japanese eel spermatozoa

“…As a general rule, pH has been reported as having little effect on the activation of fish spermatozoa. A high pH, however, was reported to intensify and prolong motility in different freshwater and marine teleosts (Stoss and Donaldson, 1982), after 1 h incubation of the sperm from the testis in rainbow trout and chum salmon (Morisawa and Morisawa, 1988), and resulted in aerobic respiration and maximum survival of the sperm in African catfish (Steyn and Van Vuren, 1986). In our study, seawater of pH 2 and pH 13 did not activate eel spermatozoa; the motility of sperm had no significant difference within the pH range of 4–12.…”

Sperm Quality and Cryopreservation in Teleost: Effect of Seminal Plasma Component and Climate Change

“…The increase in Na + may be related to the high secretory activity in the sperm ducts Weismann, 1993), for P. reticulatum it seems to be one of the fundamental ions in the maintenance of seminal plasma function. For other species of the order Siluriformes, similar concentrations to those obtained in this work were observed, i.e., Clarias gariepinus 125.25±9.80 (Steyn;Van Vuren, 1986); Clarias macrocephalus 164.4±0.6 (Tan-Fermin et al, 1999), Rhamdia quelem 153.7±2.4 (Borges et al, 2005), but the deference may be due to differences in feeding conditions, age, environ-mental factors within the same species due to their reproductive processes. The Na + ion can act directly on the osmotic balance, motility, morphology, and metabolism of sperm (Rodríguez et al, 2013).…”

Morphological evidence for a permeability barrier in the testis and spermatic duct ofGymnotus carapo(Teleostei: Gymnotidae)

“…Differences observed in the protein and glycoprotein electrophoretic profiles, obtained from the blood plasma versus testicular and spermatic‐duct fluids of G. carapo , provided additional evidence for restricted fluid flow, as maintained by tight junctions, between the vascular and adluminal compartments of the these organs. Differences between the chemical composition of seminal plasma and blood plasma have already been reported in some fish species (Steyn and Van Vuren, ; Viljoen and Van Vuren, ; Li et al, ). One functional consequence of this barrier is to maintain a gradient of ions, small molecules, and proteins between blood and seminal fluid.…”

Effects of extracellular environment factors on the motility in Japanese eel spermatozoa

“…As a general rule, pH has been reported as having little effect on the activation of fish spermatozoa. A high pH, however, was reported to intensify and prolong motility in different freshwater and marine teleosts (Stoss and Donaldson, 1982), after 1 h incubation of the sperm from the testis in rainbow trout and chum salmon (Morisawa and Morisawa, 1988), and resulted in aerobic respiration and maximum survival of the sperm in African catfish (Steyn and Van Vuren, 1986). In our study, seawater of pH 2 and pH 13 did not activate eel spermatozoa; the motility of sperm had no significant difference within the pH range of 4–12.…”